National Geographic 21x-840x Digital Microscope with 4.3-inch LCD Touchscreen and Integrated CameraNational Geographic 21x 840x Digital Microscope with 4. 3 inch LCD Touchscreen and Integrated Camera Bring the wonders of science to life with the National Geographic 21x840x Digital Microscope, a powerful and easy to use tool for students, educators, and hobbyists. Its 4. 3 inch LCD touchscreen delivers crisp, full color views without the need for a traditional eyepiece, allowing multiple users to observe specimens at the same time or share them on a